健康的中间温度Thermometer

hi,
A question about the intermediate temperature in the Health Thermometer.
I just can not understand the role of the intermediate temperature in the Health Thermometer. Is it necessary? Is it the temperature before the Health Thermometer is stable?

Then I don't understand a " value |= 0xFE000000;" must be done before send the temperature.
void app_htpt_temp_send(void)
{
struct prf_date_time timestamp;

//Allocate the message
struct htpt_temp_send_req * req = KE_MSG_ALLOC(HTPT_TEMP_SEND_REQ,
TASK_HTPT, TASK_APP_HT,
htpt_temp_send_req);

int32_t value = (int32_t)(app_ht_env.temp_value);
value |= 0xFE000000;

Thanks.